Brake.



JQHN GAINES, OF GIDDINGS, TEXAS, ASSIGNOR OF ONE-HALF TO CARL I SS PATENT OFFICE.

SCHNEIDER,

0F GIDDINGS, TEXAS.

BRAKE.

Specification of Letters Patent.

Patented July 15, 1913.

To all whom, it may concern:

Be it known that I, JOHN GAINns, a citizen of the United States, residing at Giddings, in the county of Lee and State of Texas, have invented certain new and useful Improvements in Brakes, of which the following is a specification.

My invention relates to new and useful improvements in brakes and relates more particularly to a brake, which forms part of the sewing machine driving mechanism, covered by the applicants co-pending application, filed under Serial Number 609,983.

The object is to provide a brake especially adapted for use in conjunction with spring operated mechanisms that will permit of a considerable range in the amount of friction exerted upon the brake wheels.

The object of the invention is more specifically to provide a brake, consisting of a plurality of small rollers, frictionally engaging the face of a wheel or pulley and themselves adapted to be frictionally engagedby a curved band, one end of which is rigidly secured and the other adjustable in position.

Finally, the object of the invention is to provide a device of the character described that will be strong, durable, simple and etlicient and comparatively easy to construct, and also one that will not easily get out of working order.

With these, and various other objects in view, my invention has relation to certain novel features of the construction and operation, an example of which is described in the following specification as illustrated in the accompanying drawing wherein Figure l is a top view, or a view looking on the concave surface of the brake, the brake wheel not being shown. Fig. 2 is a sectional view taken upon the line wx of Fig; 1, thebrake wheel bein shown in dotted lines. Fig. 3 is an end view of a portion of the brake, showing the manner in which the brake-lever is connected to the brakeband.

Referring ,now more particularly to the drawing wherein like numerals of reference designate similar 'parts in all the figures, the numeral 1 denotes a pair of oppositely lisposed, semi-circular bars, the curve being edge ise of the bars. These bars are he in rigid relation to each other by a plurality of equidistant rods 2, transversely mechanism in conjunction with which the mounted in the bars. Each of the rods 2 carries a sleeve or roller 3, and each of the rollers frictionally engages the face of a brake wheel 4, which is concentrically mounted with the bars 1. The rollers 3 are also adaptedto be engaged by the inner surface of a semi-circularbrake-band 5, having one of its extremities rigidly secured to a cross-bar 6, mounted between the bars 1, and having its other extremity adjustable. In order to secure the necessary adjustment, a bifurcated bracket 7 is mounted upon a plate 8, which extends between the bars 1. A lever 9 is pivotally mounted between the extremities of the bracket members 7 the lower extremity of the lever 9, having pivot-al connection with the link 10, which link has pivotal engagement with the bracket 11, mounted upon the adjustable extremity. of

the brake-band 5.

A cross-bar 12, similar to the cross-bar 6 is provided adjacent to the adjustable end of the brake-band to guide the motion of the latter.

It is essential for the proper operation of the brake that the bars 1 be held rigid, and to accomplish this, a bracket 13 is transversely mounted upon the bars 1 and is itself rigidly attached to any part of the brake is used.

The accompanying drawing and specification does not call for the brake being attached to any particular form of mechanism, since it is applicable to machinery of any kind on which a brake is used.

From theabove description andfrom the drawing, the'operation of the device is evident. The speed of rotation of tine wheel 4 may be readily adjusted by increasing, or decreasing the amoilnt of tension in the. band 5.

Any suitable means (not shown) may be provided for holding the lever 9 in any place of adjustment, so that, when the desired amount of tension is secured, it may be maintained continuously; By sufliciently relaxing the tension in the brake-band 5, the wheel 4.- may be permitted to run entirely free ofthe brak What I claim is:

1. In a device of the character described, the combination with a revoluble body, having a cylindrical surface, of a plurality of rollers mountedin constant contact with said surface, and adapted to derive rotat ion therefrom and a semi-circular flexible band, substantially concentric with the re voluble body, having its concave surface closely adjacent to the rollers, one extremity ,of the'band being fixed, and means by which the other extremity of the band may be adjusted to bring me band tional engagement with the rollers.

2. In a device of the character described, the combination with a revoluble body having a cylindrical surface, of a pair of parallel semicircular bars concentric with the axis of rotation of said body and receiving between them a rim portion of the same, a plurality of parallel rollers mounted beinto or out of fric-' tween said bars and having constant contact with the cylindrical surface of said body,

and a semicircular flexible band having its concave surface closely adjacent to said rollers, one extremity of the band being fixed and means by which the other extremit said band into or out of frictional engagement with the rollers.

In testimony whereof I have name to this specification in the two subscribing witnesses.

JOHN GAINES.

signed my presence of Witnesses J. R. FoLKEs, E. M. "PEAGUE.

of the band may be adjusted to bring 

